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A kind of preparation method of copper-zinc-based catalyst

A catalyst, copper-zinc technology, applied in the field of green preparation of copper-zinc-based catalysts, can solve problems such as waste water, and achieve the effects of easy washing to remove impurities, fewer preparation steps, and easy control of preparation conditions

Active Publication Date: 2019-09-17
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to propose a green preparation method for copper-zinc-based catalysts to solve the problem of producing a large amount of NO in the current industrial preparation of copper-zinc-based catalysts. 3 - and NH 4 + waste water problem

Method used

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  • A kind of preparation method of copper-zinc-based catalyst

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 62g CuCO 3 and 187.5 g ZnCO 3 Stir and disperse at 50°C, 500mL of 0.5% Na 2 CO 3 Dispersion system 1 was obtained in aqueous solution; Dispersion system 1 was placed in a microwave field (frequency 2×10 3 MHz, the power is 1000W) and stirred for 10h to obtain dispersion system 2; add 12.475g Al to dispersion system 2 2 o 3 and 12.475g MgO and stirred and dispersed to obtain the dispersion system 3; the dispersion system 3 was filtered and washed with deionized water until the conductivity of the filtrate was less than 5μS / cm, and the catalyst precursor was obtained by filtration. The precursor was dried at 60°C, granulated, and heated at 300°C Calcined at lower temperature for 3 hours, and finally pressed into tablets and crushed to 20-40 mesh to obtain catalyst G1.

Embodiment 2

[0023] 124g CuCO 3 and 187.5 g ZnCO 3 Stir and disperse at 60°C, 500mL NaHCO with a mass concentration of 1% 3 Dispersion system 1 was obtained in aqueous solution; Dispersion system 1 was placed in a microwave field (frequency 5×10 3 MHz, the power is 800W) and stirred for 5h to obtain dispersion system 2; add 9.345g Na to dispersion system 2 2 Al 2 o 4 , 21.805g ZrO 2 and 9.345g BaO and stirred and dispersed to obtain dispersion system 3; the dispersion system 3 was washed by suction filtration with distilled water until the conductivity of the filtrate was less than 5μS / cm, and the catalyst precursor was obtained by filtration. The precursor was dried at 80°C, granulated, and roasted at 350°C 3h, and finally pressed into tablets and crushed to 20-40 mesh to obtain catalyst G2.

Embodiment 3

[0025] 99.2g CuCO 3 and 100g ZnCO 3 Stir and disperse at 70°C, 250mL of K with a mass concentration of 5% 2 CO 3 Dispersion system 1 was obtained in aqueous solution; Dispersion system 1 was placed in a microwave field (frequency 2×10 4 MHz, the power is 600W) and stirred for 2h to obtain dispersion system 2; add 19.92g TiO to dispersion system 2 2 and 5.976g La 2 (CO 3 ) 3 And stir and disperse to obtain the dispersion system 3; use deionized water to filter and wash the dispersion system 3 until the conductivity of the filtrate is less than 5 μS / cm, and filter to obtain the catalyst precursor. The precursor is dried at 100 ° C, granulated, and roasted at 350 ° C for 3 hours. Finally, it was pressed into tablets and crushed to 20-40 mesh to obtain catalyst G3.

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Abstract

Belonging to the technical field of catalyst preparation, the invention in particular relates to a green preparation method of a copper and zinc based catalyst. The preparation process includes: dispersing carbonate of copper and carbonate of zinc in a dispersant containing a crystal modifier to obtain a disperse system 1, and placing the disperse system 1 in a wave field for treatment so as to obtain a disperse system 2; adding a carrier and an additive into the disperse system 2 and performing dispersion to obtain a disperse system 3; and washing the disperse system 3 with water, and performing filtering to obtain a catalyst precursor, carrying out drying, pelletizing and roasting on the precursor, and finally conducting molding so as to obtain the copper and zinc based catalyst. The preparation method provided by the invention has the characteristics of green process, and no generation of nitrogen-containing waste water, and the prepared catalyst has good catalytic performance.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, and in particular relates to a green preparation method of a copper-zinc-based catalyst. Background technique [0002] Copper-zinc-based catalysts are commonly used catalysts in industry, and are widely used in catalytic hydrogenation reactions, dehydrogenation reactions, and oxidation reactions. At present, the preparation of industrial copper-zinc-based catalysts is mainly based on the precipitation method. In the preparation process, nitrate is used as the raw material, and alkali containing sodium or potassium, or ammonia water is used as the precipitant. The preparation process will produce a large amount of NO 3 - and NH 4 + The waste water has brought huge pressure on the reduction of emissions to the catalyst production enterprises. In order to adapt to the national trend of increasing requirements on the discharge of three wastes from chemical enterprises, it is necessar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J37/34B01J27/236
Inventor 于杨陈海波魏士新殷玉圣
Owner CHINA PETROLEUM & CHEM CORP